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228666728 = 23171918803
BaseRepresentation
bin11011010000100…
…10110101101000
3120221021110210002
431220102311220
5432014313403
634405042132
75444430563
oct1550226550
9527243702
10228666728
11108092774
12646b6348
13384b3474
14225254da
151511d188
hexda12d68

228666728 has 32 divisors (see below), whose sum is σ = 456399360. Its totient is φ = 107032320.

The previous prime is 228666719. The next prime is 228666749. The reversal of 228666728 is 827666822.

228666728 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21575 + ... + 30377.

It is an arithmetic number, because the mean of its divisors is an integer number (14262480).

Almost surely, 2228666728 is an apocalyptic number.

It is an amenable number.

228666728 is a deficient number, since it is larger than the sum of its proper divisors (227732632).

228666728 is a wasteful number, since it uses less digits than its factorization.

228666728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9017 (or 9013 counting only the distinct ones).

The product of its digits is 774144, while the sum is 47.

The square root of 228666728 is about 15121.7303242718. The cubic root of 228666728 is about 611.5063799885.

The spelling of 228666728 in words is "two hundred twenty-eight million, six hundred sixty-six thousand, seven hundred twenty-eight".

Divisors: 1 2 4 8 17 34 68 136 191 382 764 1528 3247 6494 8803 12988 17606 25976 35212 70424 149651 299302 598604 1197208 1681373 3362746 6725492 13450984 28583341 57166682 114333364 228666728